Depth gauge for chain saws



uly 1, 1953 J. M. HANSON, SR 2,645,859

DEPTH GAUGE FOR CHAIN SAWS Filed June 29, 1951 I INVENTOR. JO/IN r1. I'M/n04; s/r.

I the walls I4 is a pair of openings 55 an opening I! in an elongated file plate Patented July 21, 1953 UNITED STATESTQ PATENT OFFICE 2,645,859 DEPTH GAUGE FOR CHAIN SAWS John M. Hanson, Sr., Alsea,"-reg. Application June 29, 1951, Serial No. 234,237

2 Claims. (C1. 33202) The present invention relates to an improve ment in depth gauges for chain saws and par ticularly an improvement over my (so-pending application, Serial No. 9, 1950, now Patent 2,592,278, granted April 8, 1952, and it consists structions and arrangements of parts herein described and claimed.

It is an object of the present invention to pro vide a device of the character set forth having 'novel means for accurately positioning a file plate with respect to a straight edge both forming parts of the invention.

Another object of the invention is the pro vision, in a device of the character set forth, of novel spring actuated means for maintaining file plate in position with respect to the remainder of the device.

Still another object of the invention is the provision of novel means for selectively positioning a file plate arm with respect to a straight edge, both forming parts of the invention.

Other and further objects of the invention will become apparent from a reading of the following specification taken in conjunction with the draw ing, in which:

Figure l is a side elevational View of an embodiment of the invention,

Figure 2 is a plan view thereof,

Figure 3 is a sectional view taken along line 33 of Figure 2,

Figure 4 is a sectional view taken along line 4-4 of Figure 1,

Figure 5 is a forming a part perspective view of a dial bolt of the invention,

Figure 6 is a perspective view of a file plate arm forming a part of the invention,

Figure 7 is a perspective view of a base which likewise comprises a straight edge forming a part of the invention, and

Figure 8 is a perspective view forming a part of the invention.

Referring more particularly to the drawing, there is shown therein an elongated body It) of a file plate whose bottom is of flat construction forming a straight edge I I and whose upper face is provided is open at one recess 52 provides end, as indicated at I 3. The

. a pair of upstanding walls M.

and transversely through and a pin it extends through the openings 55 and through arm i 8 which is adapted to lie within the recess I2 adjacent the inner end of the arm 8 a recess I9 Extending centrally 178,365, filed on August in the combinations, con-' and an integrally file plate 24 presents 6.4 is provided in the underside of the arm I8 while theforward or outer end of the arm I8 has integrally formed therewith an upstanding bracket 20. I

Immediately below the recess i9 there is provided in the lower part of the recess I2 a further recess 2| and a compression spring 22 is mounted in the recesses I9 and 2| to normally force the inner end of the arm I8 in'an upward direction and to thus force the outer end of the arm la in a downward direction.

The bracket 20 is provided with a horizontally extending threaded slot 23and there is provided a file plate 24 which-has a centrally disposed slot formed upwardly extending arm 26 which is provided with a milled slot 21 which is adapted to The arm- 26 is provided with a horizontally extending threaded opening 28 whereby a stove screw 29 or the like may be utilized to fasten the arm 26 to the bracket 20, as indicated, for example in Figure 3 of the drawing.

Adjacent the open end I3 of the recess I2 there is provided in the walls I4 a pair of transverse openings 30. Extending through the openings 30 is the threaded shank 3| of a dial bolt having a knurled head 32 and, inwardly of the head 32, a cylindrical dial 33 having indicia 34 thereon and, inwardly of the dial 33, a cam portion 35. Mounted upon the threaded portion of the shank 3| is a lock nut having a knurled portion 36 and, inwardly thereof, a hexagonal nut-shaped portion 31. i

The file plate 24 is preferably formed of case hardened steel and the threads upon the shank 3| are preferably twenty-four to the inch while the indicia 34 upon the dial 33 is preferably marked to indicate ten-thousandths of an inch. Upon the upper side of the member I0 immediately above one of the openings 35 adjacent the dial 331there is formed a marker 38 by which the dial indicia 34 may be read.

In operation, it will be apparent that the straight edge II may first be placed upon a pair of blades 38a of a chain saw 39 after which the file plate 24 may be adjusted by first loosening the lock nut 3631 and then turning the dial 33 until the proper indicia 34 registers with the marker 38 after which the lock nut may again be tightened to securely hold the same in the se lected position. This operation will cause a raising or lowering of the cammed portion 35 of the shank 3| to thus alter the angle at which the itself with respect to the straight edge I I. The outer end of the arm I8 encompass the bracket 20.

which is constantly forced downwardly by means of the spring 22 will minor modifications may be made without departing from the spirit of the invention or'the scope of the appended claims.

What is claimed is:

l. A device of the character described-com prising an elongated body having a fiat bottom and having a longitudinalextending through one end thereof, an arm apparent to those skilled in the art that many recess in the :top and centrally pivoted to said body in said recess and extending through the open end thereof; a bifurcated file plate afiixed to the-outer-endof said arm, means for adjusting the plate with respect to said body, and means for indicating said relationship between the body and said plate, said means for adjusting the plate including a com- 1 pression spring interposed between the lower end of said recess and the inner end of said arm, a cam revolubly mounted -insaid body and bearing against the underside of said arm adjacent the outer end thereof, means for revolving said cam,

and means for locking said ca i selected position.

2. A device of the character described compr1 ing an elongated body having flat bottom and having a longitudinal recess inathe top and extending through one end thereof) rm centrally pivoted to said body in said recess d t ding through the open end thereof, bif cat d file plate aifixed to the outer end oi said arm, means for adjusting the plate with r, t said body, and means for indicatin in rela. tionship between said body and said plate id means for adjusting the plate including 5 m. pression spring interposed between the low r of said recess and the inner end of said 1 cam revolubly mounted in said body and be against the underside of said arm adjacent m outer end thereof, means for revolving said ca and means ior locking said cam in selected posll tion, and saidfmeans for indicating the relation ship between' -thebody and the plate including a marker on said body, a shank for said cam, a cylindrical dial affixed to said shank having indicia upon its periphery, said dial being adjacent said marker, ;a-handle at one endof said shank, and a lock nut'for the free end of said shank.

JOHN M. HANSON, Sn.

Referencd's ,Cited in the file of this patent UNI-TEDSTATES PATENTS 1 y Number Name Date 1,43l,08'7" Baker Oct. 3, 1922 2,415,1371 Feb, 4, 1947 Johnson 

